We look at the division of 661921 by 66 
We want to figure out the number of times 661921 can be divided by 66.

Let's proceed to step 1:
66 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 66

Going ahead to step 2:
66 goes into 66 1 times with a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 66 from 66, we get 0.
Fetch the next digit (1) from the dividend, attach it to 0 and continue: 1 / 66

Step 3:
66 goes into 1 0 times with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 66

Moving on to step 4:
The number 66 fits into 19 0 times, leaving a remainder of 19.
Record the quotient 0 as the next digit in the result. 
Result so far: 100.0
Subtract 0 from 19 to get 19.
Bring next digit (2) of the dividend behind the 19 and repeat the process: 192 / 66

Going ahead to step 5:
66 can be fit into 192 2 times, resulting in a remainder of 60.
The next digit of our result is 2. 
Result so far: 1002.0
The remainder is 60 after subtracting 132 from 192.
Include the next digit (1) from the dividend after 60, then repeat: 601 / 66

Moving on to step 6:
66 can be fit into 601 9 times, resulting in a remainder of 7.
Write down 9 as next digit of the result. 
Result so far: 10029.0
Deduct 594 from 601 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 7:
When dividing 70 by 66, we get 1 with a remainder of 4.
Put 1 as the next digit of the answer. 
Result so far: 10029.1
The remainder is 4 after subtracting 66 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 8:
66 goes into 40 0 times with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 10029.1
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 9:
66 can be fit into 400 6 times, resulting in a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 10029.106
Subtract 396 from 400 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 10:
The number 66 fits into 40 0 times, leaving a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 10029.106
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 11:
If we divide 400 by 66, we get 6 and a remainder of 4.
The next digit of our result is 6. 
Result so far: 10029.10606
The remainder is 4 after subtracting 396 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 12:
When dividing 40 by 66, we get 0 with a remainder of 40.
The next digit of our result is 0. 
Result so far: 10029.10606
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 13:
If we divide 400 by 66, we get 6 and a remainder of 4.
The next digit of our result is 6. 
Result so far: 10029.1060606
The remainder is 4 after subtracting 396 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 14:
66 goes into 40 0 times with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 10029.1060606
Subtracting 0 from 40 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final result is 10029.1060606 with a remainder of 4e-08.